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From: Laszlo Hanyecz <laszlo@heliacal.net>
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To: slush <slush@centrum.cz>
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Cc: Bitcoin Development <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] Bitcoind-in-background mode for SPV
wallets
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On Apr 9, 2014, at 8:12 PM, slush <slush@centrum.cz> wrote:
>=20
> These days IPv6 is slowly deploying to server environments, but maybe =
there's some simple way how to bundle ipv6 tunnelling into bitcoind so =
any instance will become ipv6-reachable automatically?
>=20
Teredo is available by default on Microsoft systems and it's actually =
very common to see Teredo addresses as peers in torrents - this should =
work for bitcoin too, though I'm not sure if an app needs to set special =
flags to gain access to it.. there are probably some security settings =
around it. In the US, AT&T/CenturyLink provide IPv6 by way of 6RD for =
DSL customers, Comcast has native IPv6 on residential (but not business) =
cable modems, and of course those who want to can always set up with a =
tunnel broker like Hurricane Electric - they even let you use your own =
IPv6 addresses. IPv6 is great, but having an application running its =
own tunnels would not be a good way to leverage it.
Probably what's keeping a lot of them from being reachable is that most =
people just plug their CPE into a NAT router (without IPv6). Teredo can =
help here though.
Putting an IPv6 checkbox in the settings with a link to an explanation =
might help with education and result in smarter operators who can make =
their nodes reachable. A built in checker would be even better - =
something like a checklist showing red/green for different aspects of =
reachability (v4/teredo/v6).
-Laszlo
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